Secondary winding for transformers



May 22, 1951 c. MGKECHNIE SECONDARY WINDING FOR TRANSFORMERS Filed Jan.15, 1949 A INVENTOR.

[IN C. MC/lECH/V/E Patented May 22, 1951 SECONDARY WINDING FORTRANSFORMERS Ian G. McKechnie, Detroit, Mich., assignor to PrimeweldCorporation, a corporation of Michigan Application January 15, 1949,Serial No. 71,124

1 Claim. 1

This invention relates to electrical transformers, and has particularreference to a secondary winding for a transformer and the method ofmaking it.

An object of the invention is to provide a secondary winding for atransformer which has at least two complete turns but is formed of a onepiece casting.

Another object of the invention is to provide a two turn secondarywinding for a transformer which is economical to manufacture because ofthe time, labor, and machine work saved in its fabrication.

Another object of the invention is to provide a two turn secondarywinding for a transformer, which is constructed and arranged so that theprimary winding may be substantially enclosed by it.

Another object of the invention is to provide a unitary secondarywinding of more than one turn, which is provided with inbuilt coolingelements.

The foregoing and other objects and advantages of the invention willbecome more apparent as the description proceeds, reference being madefrom time to time to the accompanying drawings forming part of thewithin disclosure, in which drawings:

Fig. 1 is a perspective view of a device, with parts broken away,embodying the invention.

Fig. 2 is an end view of the device illustrated in Fig. 1.

Fig. 3 is a section taken substantially on the line 3-3 of Fig. 2.

Fig. 4 is a top plan view of the device shown in Fig. 1.

Referring now more particularly to the drawings, it will be understoodthat in the embodiment herein disclosed, the invention comprises aunitary casting of copper, or other electrically conductive material.The casting is formed with comparatively thick walls I defining a hollowrectangle having a rectangular opening 8. The walls I have outwardextensions 9 and H], which form a comparatively deep peripheral channelabout the casting.

The casting is also formed with comparatively thick extension wallsections H and I2, which may be drilled and threaded, as at l3, to actas terminal connections.

After the unitary casting is removed from its mold it is sawed beginningat the point I4 in the upper wall and continuing along the lines [5, l6,ll, l8 and I9 and terminating at point 20 in the lower wall so that aunitary structure results having two complete turns. The casting mayalso be formed with water tubes 2| and 22 cast therein, or the castingmay be formed with slots in which the tubes 2| and 22 may be insertedafter the casing operation is completed.

A structure formed as hereinabove described provides a secondary windingfor a transformer with two complete turns, which may be fabricated at aminimum of cost and with great economies in time, labor, and machiningoperations.

Having described my invention, what I claim and desire to secure byLetters Patent is:

A two-turn secondary winding comprising a hollow rectangular body, theperiphery of which is channel shaped in cross section, the bottom wallof the channel being comparatively thicker than the side walls and thebottom wall of the channel having a, cut therein extending along itsmedian line from a point on said median line to a second point on saidline spaced from said first point, and a cut extending outwardly fromeach end of said median line out, each of said last named cuts extendingin an opposite direction through one of the side walls of said channel.

IAN C. McKECHNIE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 508,620 Johnson et al Nov. 14,1893 1,471,096 Brand Oct. 16, 1923 1,908,749 Groven May 16, 19332,366,290 Rudd Jan. 2, 1945 2,459,894 Powell Jan. 25, 1949 2,482,299Stevens Sept. 20, 1949 FOREIGN PATENTS Number Country Date 171,836 GreatBritain Dec. 1, 1921

